傳感器在商業(yè)照明中的應(yīng)用

　　商業(yè)照明部門正變得越來越復(fù)雜，因?yàn)樾碌恼彰鞴庠幢灰耄藗儗?duì)他們所能做的事情的期望越來越高。本文著眼于各種形式的傳感可以幫助應(yīng)對(duì)不斷變化的商業(yè)照明部門的挑戰(zhàn)的方法。

　　把音量調(diào)小些。

　　“綠色”建筑的發(fā)展趨勢(shì)，旨在減少建筑和運(yùn)營(yíng)過程中使用的能源，促使承包商尋找更有效的方法來控制商業(yè)照明所消耗的能源。一種顯而易見的方法是使用運(yùn)動(dòng)傳感器檢查是否有一個(gè)房間或開放的計(jì)劃空間，并相應(yīng)地調(diào)整燈光。

　　熱釋電器件，如被動(dòng)紅外傳感器，經(jīng)常被用于這種類型的占用感應(yīng)，以及在更熟悉的背景下防盜報(bào)警。

　　這種傳感器的工作原理很簡(jiǎn)單：一種晶體感應(yīng)元件在暴露于紅外線輻射時(shí)產(chǎn)生電荷，如人體熱。紅外輻射越多，產(chǎn)生的電壓就越高。在商業(yè)的PIR傳感器、菲涅爾透鏡用于聚焦的紅外輻射對(duì)傳感元件和車載放大器增強(qiáng)信號(hào)和旅行的輸出如果它開始變的太快。

　　For commercial premises， the sensor needs a reasonable sensing range. Parallax， Inc. makes the 555-28027 passive infrared （PIR） sensor with a sensing range of about 20 feet， depending on the operating conditions. It is a simple three-wire device， with a single-bit output indicating when motion is sensed. The sensor usually needs a ‘warm-up’ time to adapt to its operating environment， but this won’t be an issue in commercial applications in which the lighting control system is always on.

　　Zilog takes the PIR sensing strategy a step further with its ZMotion family of detection and control products. The difference here is that the ZMotion parts include a microcontroller， rather than having to be connected to one like the Parallax parts， and are available with a variety of lenses to match the sensor’s region of operation to a particular application. The local microcontroller can be programmed with a variety of sensing algorithms， again to tune the way the sensor works to the application. The result， according to Zilog， is a more sensitive and stable sensor， which should lead to fewer false positives.

　　The Fresnel lens options shape the area over which the ZMotion sensors work. An ‘Animal Array’ version is designed for use very high up on warehouse walls， or mounted where two walls meet. Mounted 2.1 meters up a wall， Zilog says the Animal Array can sense an 88° arc in front of it， out to a radius of 15 meters.